Soldiers have already been sent to support police in troubled areas, Defence Minister Nosiviwe Mapisa-Nqakula said in a live broadcast.
The minister made the announcement in Alexandra, a Johannesburg township where a Zimbabwean couple survived a shooting overnight. The man and woman were both shot in their necks and the woman suffered an additional shot in her leg, the minister said. Both Zimbabweans were treated and discharged from hospital.
In the same Alexandra area, a Mozambican man was stabbed to death by four South African men over the weekend. Photographs of the stabbing were published in a local newspaper on Sunday. The four South African men appeared in court today and remain in police custody, said Velekhaya Mgobhozi, the National Prosecuting Authority spokesman.
The recent spate of attacks has mainly affected immigrants from African states like Malawi, Mozambique and Zimbabwe, according to a statement from the aid group, Doctors Without Borders.
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The South African attacks on foreigners have angered many in other African countries.
In Malawi, nearly 2,000 protesters marched to the South African High Commission, demonstrating against the wave of violence, said Billy Mayaya, a human rights activist. A diplomat at the South African mission said earlier that there were several hundred marchers.
The march organisers called on the South African government to do more to protect immigrants and handed a petition to South African High Commissioner Cassandra Mbuyane-Mokone.
Nearly 400 Malawians returned home yesterday, travelling overnight by bus from South Africa, Malawi's Information Minister Kondwani Nankhumwa said.